Spectrum-Efficient Distributed Compressed Sensing Based Channel Estimation For Ofdm Systems Over Doubly Selective Channels


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Sensing and power strategy optimization is important research topics in cognitive radio systems that hold the promise of advancing green communication. This concept gives us a brief overview of the existing power allocation design in the literature and unifies them into a general power allocation framework. Based on the closed-form solution derived for this general problem, the impact of network topology on the system performance is highlighted, which motivates us to propose a novel location-aware strategy that intelligently utilizes frequency and space opportunities and minimizes the overall power consumption while maintaining the quality of service of the primary system. This work shows that in addition to exploring spectrum holes in time and frequency domains, spatial opportunities can be utilized to further enhance energy efficiency for CR systems.

Existing Method:

  • Hard-decision resource allocation (HDRA)
  • Sensing-free resource allocation (SFRA)


  • Severe fading over the distant end primary will leads much loss of bits on the primary receiver so the primary user should take a decision would leads efficient secondary network sensing and connection capacity over the particular user.
  • Already done technique would leads abrupt spectrum releasing and continue over the other spectrum sensing is done over the network provided in it to new network as a secondary user

Proposed Method:

  • Location-Aware relay based Resource Allocation

Block Diagram:

Fig: location awareness sensing system?


  • Spectrum sensing can be done over the network based on a relay leads to high data transmission rate over the user allocated
  • Lowers the spectrum sensing time over the network provided in sensing
  • User will be able to transmit the data without any eavesdropper?s attack under the network it is available in the sensing area


  • Hospital ambulance and urgency aware service scheme systems can apply these technique in there user equipment topology

Software Requirement:-

  • MATLAB 7.8 or above versions


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